operator==,!=(std::istream_iterator<T, CharT, Traits, Dist>)

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std::istream_iterator
Defined in header <iterator>
template < class T, class CharT, class Traits, class Dist >

bool operator== ( const std::istream_iterator <T, CharT, Traits, Dist> & lhs,

const std::istream_iterator <T, CharT, Traits, Dist> & rhs ) ;
(1)
template < class T, class CharT, class Traits, class Dist >

bool operator! = ( const std::istream_iterator <T, CharT, Traits, Dist> & lhs,

const std::istream_iterator <T, CharT, Traits, Dist> & rhs ) ;
(2) (until C++20)
friend bool operator== ( const istream_iterator& i, std::default_sentinel_t ) ;
(3) (since C++20)

Checks whether both lhs and rhs

1) Checks whether lhs is equal to rhs.
2) Checks whether lhs is not equal to rhs.
3) Checks whether lhs is an end-of-stream iterator.
This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup

The != operator is synthesized from operator==.

(since C++20)

Parameters

lhs, rhs - stream iterators to compare

Return value

1) true if lhs is equal to rhs, false
2) true if lhs is not equal to rhs, false
3) true if lhs is an end-of-stream iterator, false

Exceptions

May throw implementation-defined exceptions.

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 261 C++98 the description of operator!= was missing added
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